Add experimental framework token generation tool

tools/origin_trials/third_party/ed25519/README.chromium

Index: tools/origin_trials/third_party/ed25519/README.chromium
diff --git a/tools/origin_trials/third_party/ed25519/README.chromium b/tools/origin_trials/third_party/ed25519/README.chromium
new file mode 100644
index 0000000000000000000000000000000000000000..91f0630b0aef022cfb55b3a84ec6982bff4aafa3
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+++ b/tools/origin_trials/third_party/ed25519/README.chromium
@@ -0,0 +1,15 @@
+Name: Ed25519: high-speed high-security signatures
+Short Name: Ed25519
+URL: http://ed25519.cr.yp.to/software.html
+Version: 0
+License: Public Domain
+License File: NOT_SHIPPED
+Security Critical: no

[palmer, 2016/02/11 22:03:20]

I think I agree, but it looks a bit strange. :) Can you add a comment about why
we don't consider it security-critical, even though it's about cryptographic
signatures? And, if this library gets used for new purposes, how that No could
turn into a Yes.

[iclelland, 2016/02/12 22:00:50]

I'll do that, certainly. Is there a standard for free-form comments in this
file?

[iclelland, 2016/02/16 20:25:12]

Done.

+
+Description:
+This package is used by the command-line utilities in tools/origin_trials to
+sign tokens for experimental feature usage, and to verify the signatures on
+those tokens.
+
+Local Modifications:
+None.